Pick up some sea foam. Can not the spray, Put 1/3 of the can in the gas tank 1/3 of the can into the oil and the more difficult 1/3 into the intake. Warm up the engine, a short drive to the bank or something, but not super hot. Then either very slowly poor it into the intake (it’ll stutter a bit, try not to stall it) or use a vacuum line to suck it in once all of its in turn the engine off and let it work. Then when you restart it, the engine will burn off a crap ton of nasty and throw a smoke screen like James Bond could only dream of
First how to video I could find.
https://youtu.be/7VMGQrvwfGE
YouTube people think it’s smart to redline the engine to get it out, don’t be that guy, half revs then when the smoke is mostly gone go for a drive. If you have turn down exhaust tip and like your driveway throw a piece of cardboard on the ground.
If it doesn’t quiet your engine down you’re only out 10 bucks and will have a slightly cleaner engine.
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